Optimized retrofit design of in-service monopile foundation offshore wind turbine transition zone

被引:9
作者
Schaffer, William [1 ]
Seo, Junwon [1 ]
Choi, Eunsoo [2 ]
Lee, Jaeha [3 ]
机构
[1] South Dakota State Univ, Dept Civil & Environm Engn, Brookings, SD 57007 USA
[2] Hongik Univ, Dept Civil Engn, Seoul 04066, South Korea
[3] Korea Maritime & Ocean Univ, Dept Civil Engn, 609 Engn Bldg 2, Busan, South Korea
关键词
Optimized retrofit; Monopile foundation; Offshore wind turbine; Finite element analysis; Response surface methodology; GROUTED CONNECTIONS; DYNAMIC-ANALYSIS; FATIGUE LIFE; BEHAVIOR; PIECE; LOAD; CAPACITY; STRENGTH; CLAY;
D O I
10.1016/j.engstruct.2020.111001
中图分类号
TU [建筑科学];
学科分类号
0813 ;
摘要
This study proposed a new retrofit solution using bolted connections for in-service offshore wind turbines (OWTs) with monopile foundation via a finite element analysis-based optimization approach. The monopile foundation 5 MW OWT provided by National Renewable Energy Laboratory (NREL) was selected for this study. The transition zone of the monopile OWT subjected to wind and wave loadings, the grout connection of the tower to the monopile, was specifically simulated with three different models using the ANSYS software. The three models included a plain model resembling the installed monopile, a shear key model considering the Det Norske Veritas (DNV) updated design, and a retrofit model incorporating the plain model with the bolted connection installed. Numerical results of three different transition models were compared to determine the efficacy of the proposed retrofit solution. Along with the numerical results, the proposed retrofit bolted con-nection was optimized through implementation of response surface methodology (RSM) with six input para-meters (e.g., bolt diameter) and three outputs (e.g., fatigue life). With the RSM data, the desirability function was employed on three different runs, in an attempt to obtain the most optimal retrofit bolted connection for the monopile OWT. A key finding indicated the optimized configuration of the bolted connection with high strength bolts of 0.036 m diameter to be installed in eight columns and five rows exceeded the required fatigue life.
引用
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页数:16
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